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2 Sheets-Sheeh 11 E. H. CLARKSON; I VALVE FOR WATER BOILERS.

N0. 105,549f Patented July 19, 1870. I

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' 2 Sheets-Sheet 2.

E. H. GLARKS'ON. VALVE FOR WATER BOILERS.

,No. 105,549. Patented July 19, 1870.

I jiyx the cooking apparatus.

" dished fifties hnwaiinn. GLARKSON; or ALEXANDRIA, VIRGIN-IA, ASSIGNOR TO HIM-.-

SELF AND JAMES 11,. ROBINSON.

Letters Pat'mtNo.105,5d9, was July 19, 1870. i

var-v1: For: WATER-BOILERS.-

W The'sehednle refe rrod to'in tneee Letters Patent and making part ol-the name.

To all whom it may concern:

Be it khown that I, EDWARDH. CL A'RKSON, of,

Alexandria, in the county of Alexandria and State of Virginia, have-invented certainne'w and useful Improvements in: Back-pressure Valves; and I do hereby-declare that-,the followin isa full,.clear, and exact description of the same, re erenc'e being bad to the accompanying drawing andto' the letters of reference marked thereon making apart of this specification, in whichv Figure -1 is a side view, one-half of the connecting pipe being removed.

Figure 2 is a modification offig. 1. Figure 3 is a bottom view. Figure 4, isa side sectional view of a stove and boiler, with my back-pressure valve attached.

Figure 5 is a top v plan-viewof a. stove and boiler,- with my back-pressure valve attached.

This invention is designed principally to remedy a great defect in the successful operation of those wash-v boilers whichare arranged-in therear of the'eookingstove, and are so connected as not to interfere with In this class of inventions the receiving and discharge-tubes of the boilerare connected by a pipe,

which passes throughthe fire-pot of-the stove, and it is designed that the water in the boiler shall pass into this pipe, become heated in its passage-through the fire-pot, and be discharged in a continuous stream through the exit'tube.

Practical experience, however, has demonstrated that when the" water becomes-heated, the steam generated in. seeking its exit is just as 'apt to force the water baek'through the receiving-tube as to force it forward through the discharge-tube.

The object of this invention, 'thereforeiisto prerent. this ,-b'ack flow, and cause the water-to be discharged through the exit-tube in a constant and regular stream.

The nature of my invention consists in securing inside the connecting-pipe, andclose to its junction with the boiler, ashort conioal-shaped pipe.

'lo the'bottom of this short pipe'is suitably hinged a circular plate, a littlegreater in diameter than the mouth'of the conical pipe. i

The natural tendency of this circular plate is to fall,

and leave perfectly'open and free the mouth of the co'nicalpip'e.

Tov the outside of the conical 'pipcis securely attached. an L-shaped bearingsplate, soarranged that when the circular plate, is in its natural position, it rests upon the end or arm of this hearingplate,occupying an angle of about forty-five degrees.- This al--- lows the water in the boiler or other vessel to pass freely'intothe connctingpipawhil, when the same becomes heated, and i's-forced back by the steam, it will strike the bottom of the circular plate, and close the mouth. of the conical pipe.

. By this action, the heatedwateris'forced to seek its exit through the discharge-tube, and fresh water from the boilenin the meanwhile pressing upon and opening the mouth of the conical pipe, a constant stream of hot water is thrown into the boiler or other vessel. By this. method, a large quantity of water can be heated in a boiler orother vessel more rapidly than .by placing the vesscldirectly over the fire.

- To enable others skilled iu-the art to make and use my invention, I willnow proceed to describe its construction and operation. p

A is the connecting-pipe, which passes through the I fire-pot A, and is provided with a flange, A, by

means of which it is securely attached to the boiler F, or other vessel. v

B is the cone-shapedv pipe, and is attached to the pipe A, near-its connection with the boiler.

O is a circular plate, whose diameter is a little greater than the diameter of the mouth of the conical pipe B.

This plateQ is hinged to a curved rod, 0, secured to the outside of the pipe B, and extending a little belowthe mouth 'ofthe same.

D is an L-shaped bearing or'support-plate, which is securely fastened .to the outside of the pipe B, and immediately behind the curved rod 0.

This hearing or support-plate D extends down below the mouth of thepipe 'B'a snilicient distance, so

that when the circularplate 0 falls, it shall rest upon the arm D of the plate 1), preservingan angle of about forty fivc degrees.

This enables the water to pass freelyiuto the counecting-pipe from the boiler, while, at the same time, when the steam forces the water back, it causes the plateO to be pressed against the mouthof the pipe B, closing the same, when, of necessity,'the water, is compelled to-seek its discharge through the exit-pipe G into the boiler. I g

Instead of the circular plate 0, there may be used a hollow cone, E, as-clearly' shown in fig. 2, the diam- 'eter'of its base being a little greater than the diame- -ter of the mouth of the pipe B.

:To the apex of this cone E, and extending entirely through the same, is a guide-rod, 1 which works in suitable guide-plates. G G, the guides-plate G'heiug attached to the interior of the pipe B','and the guideplate G to the interior of the connecting-pipe A;

.'This rod E and hollow cone 1*) are prevented from falling over a certain distance by ineansof the pin' g, which passes through the rod above the guide-plate G.

I In slicet2of the drawingmy invention is shown as connected with a wash-boiler on a stove, but I do not desire to be understood as confining myself to this,

to prevent the water, after being heated, or steam fi'om flowing backward, substantially as described.

In testimony whereof I have signed myname to this specification in the presence of two subscribing witnesses.

E. H. OLARKSON.

Witnesses EDWD. JAMES, J. H. Ronmson. 

